Fisk distribution

The probability density function for the Fisk distribution is:

.. math::

f(x, c) = c x^{-c-1} (1 + x^{-c})^{-2}

where :math:x \ge 0, c > 0.

The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/fisk/fiskpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/fisk/fiskcdf.png :align: center :width: 480